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1.
A-Half-hearted response to a question that isn't important.

B-Sarcastic response to a serious question.

C-The answer given when asked a question you don't know the answer to. Ususally spoken as a question.
Example for def. A-

Person A- "What are you doing tonight?"
Person B- "My left ass cheek."

Example for def. B-

A- "Where did my purse/keys/wallet go?"
B- "My left ass cheek."

Example for def. C-

A- "Billy, what is the Capital of Zimbabwe?"
b "My left ass cheek?"
by resisdisciple May 10, 2006